panacea/modules/power.nix

{ config, lib, pkgs, ... }:

{
  # Enable the TLP daemon
  services.tlp = {
    enable = true;
    settings = {
      # Use the new CPU frequency scaling governor
      CPU_SCALING_GOVERNOR_ON_AC = "schedutil";
      CPU_SCALING_GOVERNOR_ON_BAT = "schedutil";

      # Adjust CPU frequencies accordingly to the power state
      CPU_SCALING_MIN_FREQ_ON_AC = 800000;
      CPU_SCALING_MAX_FREQ_ON_AC = 3000000;
      CPU_SCALING_MIN_FREQ_ON_BAT = 800000;
      CPU_SCALING_MAX_FREQ_ON_BAT = 2300000;

      # Enable audio power saving for Intel HDA, AC97 devices (timeout in secs).
      # A value of 0 disables, >=1 enables power saving (recommended: 1).
      # Default: 0 (AC), 1 (BAT)
      SOUND_POWER_SAVE_ON_AC = 0;
      SOUND_POWER_SAVE_ON_BAT = 1;

      # Runtime Power Management for PCI(e) bus devices: on=disable, auto=enable.
      # Default: on (AC), auto (BAT)
      RUNTIME_PM_ON_AC = "on";
      RUNTIME_PM_ON_BAT = "auto";

      # Battery feature drivers: 0=disable, 1=enable
      # Default: 1 (all)
      NATACPI_ENABLE = 1;
      TPACPI_ENABLE = 1;
      TPSMAPI_ENABLE = 1;

      # Disable touchscreen to save battery
      RUNTIME_PM_DRIVER_BLACKLIST = "usbhid";
    };
  };

  # Suspend to RAM/disk when battery is critical
  services.upower = {
    enable = true;
    percentageAction = 5;
  };
}